The MOTUL DOT 5.1 BRAKE FLUID has a long life formula: the high wetboiling point (185c / 365f), superior to dot 4 and dot 3 fluids enables to use this product longer MOTUL DOT 5.1 BRAKE FLUID 500ML Features Long life 100% synthetic fluid for hydraulic actuated-brake and clutch systems dot 5.1 is non-silicone based fluidity specially designed for anti-locking brake systems motul 5.1 fluid has a viscosity of 820 centipoises at -40c / -40f which is considerable lower than dot 4 and dot 3 brake fluids, allowing motul dot 5.1 fluid an easier fluid circulation in micro-valves